Here is the full list of all 25 Paperbark achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
A New Home (Ending Two)
Complete all other Steam Achievements
Finish the story in under 18 minutes
A New Home (Ending Three)
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Tap on all of the sounds in the sticker library
Collect all of the Stickers
Collect all of the Green Grocer Cicadas
Find all the hidden critters
Sufficiently annoy a Spoonbill
Collect all of the Helena Gum Moths
Collect all of the Gumleaf Grasshoppers
Collect all of the Yellow Albatross Butterflies
A New Home
The Cool Change
Break a lot of sticks!
The Bushfire
The River Birds
Collect all of the Blue Skimmer Dragonflies
Eat all the food patches
The Wetlands
The Paperbark Tree
Scare plenty of fairy wrens
You did it!